You should keep in mind, that the group management right now is pretty inconsistent. There are several properties, where the group data is stored and keeping the groups in that variable actually is not the right solution. We should rewrite the whole group management thing. I would expect JUser to work something like $user->addToGroup($group); and that adds the user. I would also expect to have a proper $user->getGroups(); Both are not present. There is a getAuthorisedGroups() method, which reads and writes to a different internal property. So this is a larger complex.

Hi Hackwar,

Of course, I understand that the group management right is pretty inconsistent today but before it is improved, I suggest this quick, simple and sure solution to correct this issue.

In any case, can you please fix the codestyle errors that you have in your code?

I'm not sure what you're tryig to do here.
I get that you temporary store the groups to avoid it getting lost, but since the method returns shortly after and the $user object isn't passed to anything, I don't understand the purpose of it.
Can you elaborate?

There is also JUser::getAuthorisedGroups(), which should be better to retrieve the groups of your user than accessing an internal var directly.

It is difficult to explain but I going to try

1. The 'save' function of profile.php, create a temporary JUser object to bind and save the new values.

2. The 'save' function of JUser saves the values in the database and it is very important, stores also the object JUser in a session of PHP (see around the line 819 of user.php)

3. When I set the groups propertie of JUser, I change also the groups propertie of JUser in session of PHP because the set function of JSession just assigned the value (not serialize). And in PHP, the objects are assigned by reference.

4. After when I come back in the site and I use the JFactory::getUser I retrieve the object JUser saved previously in the session of PHP.

I hope my explanations are clear with my very bad english.

Last thing, I believe also the 'set' and 'get' funcions of JSession should be improved

Thank for your suggestion Hackwar. I looked the JUser::getAuthorisedGroups function and I found another function JAccess::getGroupsByUser with a param to not include the inherited user groups like the groups propertie of JUser. It is a good solution for me, thank you very much.

So, if you have a solution for your problem, can this one be closed?

I have a solution for my problem, but with this solution, I bypass the issue. The issue that I explained is not resolved in the core

Setting to Needs Review so a CMS Maintainer can make a decision if this is required in the core

Will be this fix included in some patch ?

Because i'm very afraid to modify core files, i dont' want to lose this pretty fix after next joomla update.
(I'm new to this tracking method)

Currently, no. There aren't enough tests to even consider it.

I tested the offered patch successfully as it seems to solve the problem described.

What I did before patching:

First I investigated the property groups' setting with a new created profile:
Result: ["groups"]=> array(1)

After editing and saving the profile:
Result: ["groups"]=> NULL

After I applied the patch, editing and saving the profile:
Result: ["groups"]=> array(1)

So this is why I marked my test as successful as I think and hope this is the result you were looking for.

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Hi Flow87,

Thank you very much for your test

Thank you @colivier. We decided to accept the small fix.